Earn point on your loyalty program!arrow arc left

Cheap flights from Chicago (CHI) to Seattle (BFI)

Know your dates, get live prices in seconds
airplane logo

pin logo

calendar
Departure
calendar backward
Return
airplane logo
1 Adults (11+)
0 Children (2~11)
0 Infants (0~2)
Save up to 31%
Book Flight + Hotel at the same time

How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)

How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.

Cheap flights from Chicago to Seattle in May , June 2026

28 May - 03 Jun $ 811.00
CHI
Chicago
Frontier Airlines
2 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
3 STOPS
CHI
Chicago
Pick dates
27 May - 03 Jun $ 850.00
CHI
Chicago
Frontier Airlines
2 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
3 STOPS
CHI
Chicago
Pick dates
27 May - 03 Jun $ 851.00
CHI
Chicago
Frontier Airlines
3 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
3 STOPS
CHI
Chicago
Pick dates

Last minute flights from Chicago to Seattle

28 May - 01 Jun $ 954.00
CHI
Chicago
Allegiant Air
2 STOPS
BFI
Seattle
BFI
Seattle
Allegiant Air
2 STOPS
CHI
Chicago
Pick dates
27 May - 01 Jun $ 993.00
CHI
Chicago
Allegiant Air
2 STOPS
BFI
Seattle
BFI
Seattle
Allegiant Air
2 STOPS
CHI
Chicago
Pick dates
27 May - 01 Jun $ 994.00
CHI
Chicago
Allegiant Air
3 STOPS
BFI
Seattle
BFI
Seattle
Allegiant Air
2 STOPS
CHI
Chicago
Pick dates

One-way flights to Seattle from Chicago

7:49 PM - 6:45 PM
Air Excursions
2 Stops
25h 46m
CHI - BFI
$ 397
Kiwi
Pick dates
7:49 PM - 6:45 PM
Air Excursions
2 Stops
25h 46m
CHI - BFI
$ 421
Kiwi
Pick dates
8:46 PM - 4:05 PM
Air Excursions
2 Stops
22h 9m
CHI - BFI
$ 484
Kiwi
Pick dates

How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)

Related info for your journey
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.